| Lat / long: | 37.58931, -121.61243 |
| Tertiary: | Manganese, Silica |
| Other material: | Chert, Psilomelane, Pyrolusite |
| Discovery year: | 1884 |
| Operation type: | Underground |
| Development status: | Past Producer |
| First production started: | 1885 |
| MRDS | M004665 |
| MAS | 60010003 |
| DEP | 10211101 |
| Reference | {Deposit:: CDMG,BULL.76,1918}{Deposit:: CDMG,BULL.152,1950}{Deposit:: CDMG,BULL.125,1943}{Deposit:: CDMG,BULL.140} |
| Reporter | Deino, Al |